The TM220 designation means the thermal element is fixed at the frame rating while the magnetic pickup is adjustable — in this case the li max (instantaneous trip threshold) is adjustable up to 1,600 A, giving you a 10:1 range over the 160 A frame to coordinate with downstream branch devices or motor inrush. Breaking capacity sits at 121 kA at 240 V AC, 75.6 kA at 415 V, and still delivers 11.9 kA at 690 V — a strong short-circuit withstand across common industrial voltage levels. If your panel internal ambient runs above 50 °C, size the load at the 70 °C column — 150 A — not the nameplate 160 A. Power dissipation is 38 W at rated load, which matters for enclosure thermal calculations in a sealed non-ventilated panel.
Footprint is 101.6 mm wide (4 in), 130 mm tall, 70 mm deep — a standard SENTRON 3VA frame size that drops into existing 3VA panel cutouts and busbar systems without re-drilling. The breaker accepts an optional motor drive (Product Extension / Optional / Motor Drive = Yes), so it can be remotely tripped or reset via a shunt or undervoltage release — useful for emergency-off circuits or remote disconnect schemes.